Tranny lag when accelerate.
Thread Starter
Member
Joined: Jun 2008
Posts: 188
Likes: 1
From: Los Angeles, CA
2007 E550 Sports
Tranny lag when accelerate.
Is there a ECU program that can make the tranny more reaponsive? everytime I want to accelerate aftwr breaking or just plain accelerate from crusing the tranny has at least 1 second lag, before it will change gear. I know it is to provide smooth accelerate. but isnt that the C/S is for?
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Joined: Mar 2004
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From: Ft. Lauderdale Area, USA
2015 ML 350
The C/S switch just determines which program the transmission will follow. C starts the transmission in 2nd, while S starts it in 1st.
Try pressing the gas pedal down a little quicker & further down. It will force a faster downshift.
Try pressing the gas pedal down a little quicker & further down. It will force a faster downshift.
Senior Member
Joined: Aug 2007
Posts: 440
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From: Exit 16E
07 E350 4Matic / Sport with P1
Is there a ECU program that can make the tranny more reaponsive? everytime I want to accelerate aftwr breaking or just plain accelerate from crusing the tranny has at least 1 second lag, before it will change gear. I know it is to provide smooth accelerate. but isnt that the C/S is for?
Ck your PMs too.
Member
Joined: Feb 2007
Posts: 142
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From: Houston
2020 E450 Coupe, 2022 Porsche Macan, 2001 Porsche 911
Could someone please explain the "learning treanny" feature that our cars are supposed to have?
I was told that our cars learn our driving habits, so if you're driving like a granny then your car shifts like a granny, and if you're driving like an 18 year old (or like me) then it learns to shift faster...
Is that true, and if so, can that feature be disabled? And if it is true, how long does it take the tranny to learn the mode (or mood) you're in?
Thanks!
I was told that our cars learn our driving habits, so if you're driving like a granny then your car shifts like a granny, and if you're driving like an 18 year old (or like me) then it learns to shift faster...
Is that true, and if so, can that feature be disabled? And if it is true, how long does it take the tranny to learn the mode (or mood) you're in?
Thanks!
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Joined: Nov 2004
Posts: 1,691
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W221 S600, W220 S55 AMG Kompressor, W124 300E, W140 S320, W210 E3204M W164 ML320 Bluetec
Could someone please explain the "learning treanny" feature that our cars are supposed to have?
I was told that our cars learn our driving habits, so if you're driving like a granny then your car shifts like a granny, and if you're driving like an 18 year old (or like me) then it learns to shift faster...
Is that true, and if so, can that feature be disabled? And if it is true, how long does it take the tranny to learn the mode (or mood) you're in?
Thanks!
I was told that our cars learn our driving habits, so if you're driving like a granny then your car shifts like a granny, and if you're driving like an 18 year old (or like me) then it learns to shift faster...
Is that true, and if so, can that feature be disabled? And if it is true, how long does it take the tranny to learn the mode (or mood) you're in?
Thanks!
1. Turn the ignition key to the on (not start) position.
2. Press the gas pedal to the floor and hold for five seconds.
3. Turn the key to the "off" position (don't remove the key), then release the gas pedal.
4. Wait at least two minutes for ECU to reset.
Super Member
Joined: Jun 2008
Posts: 835
Likes: 2
From: Bay Area, CA
09' E320
In item #2, the key is to depress the kickdown switch.
Keep in mind that wiping memory wipes adaptation values also which are needed to understand any faults the trans may have in the future. They are the techs most important diagnostic tool.
That said, the trans does re-adapt rather quickly (50 miles or so) typically. I wouldn't make a weekly or monthly habit of resets personally nor when having trans problems.
Keep in mind that wiping memory wipes adaptation values also which are needed to understand any faults the trans may have in the future. They are the techs most important diagnostic tool.
That said, the trans does re-adapt rather quickly (50 miles or so) typically. I wouldn't make a weekly or monthly habit of resets personally nor when having trans problems.
Member
Joined: Apr 2007
Posts: 111
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From: Chicago, IL
2003 E500 Sport, 1999 ML430 & Regal 402 Commodore
Thanks for the reset tip. I tried it today & it wiped out the lag & twitchiness. It's actually working like my other MB's. I guess the owner before me may have had a twitchy foot...
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Joined: Feb 2007
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From: Houston
2020 E450 Coupe, 2022 Porsche Macan, 2001 Porsche 911
I did it today and it seems like "night and day" unless it's my imagination...hopefully I won't get spanked by the dealer the next time I take it in for service and they find out I reset the tranny...
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Super Member
Joined: Apr 2006
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From: Raleigh NC
2007 E63, 2006 C55
RE: Acceleration Lag
In addition to all that has been said, my experience has shown that doing the ECU reset on the 07 up cars will help some, but does not have the dramatic effect it showed on my 05 E500. The later cars have a more sophisticated ECU that does a lot more behind the scenes in terms of storage adapting etc.
What I have learned is that your driving style over time is ultimately how your car will perform. By switching to C mode when in rush hour stop/go traffic, the ECU will retain the Sport (S) mode settings that are stored and will not learn the sluggish behaviors from a 10 mph commute.
When not in traffic, I always use S mode, and drive it like a sports sedan, using both full and part throttle kickdown as traffic permits, and not being bashful with the go pedal. My car has excellent throttle response and performance in S mode.
What I have learned is that your driving style over time is ultimately how your car will perform. By switching to C mode when in rush hour stop/go traffic, the ECU will retain the Sport (S) mode settings that are stored and will not learn the sluggish behaviors from a 10 mph commute.
When not in traffic, I always use S mode, and drive it like a sports sedan, using both full and part throttle kickdown as traffic permits, and not being bashful with the go pedal. My car has excellent throttle response and performance in S mode.
Junior Member
Joined: Sep 2007
Posts: 52
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From: Jackson, MI
2008 E350 4matic
I have a sprintbooster on my car and that does not help the lag. Itr just makes your head snap back quicker when it finally downshifts.
What I do is drive using the paddles, then I can control when I want the downshift and downshift earlier.
What I do is drive using the paddles, then I can control when I want the downshift and downshift earlier.
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Joined: Jul 2007
Posts: 1,609
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From: Wyckoff, New Jersey & Alphabet City NYC
86 190E 2.3-16v, 92 500E, 03 CL55 AMG, 08 E3504M Brabus
This sneaky ECU reset does work. But from what I understand it resets the throttle settings that have been learned, not wipe out all your whole TCU memory. Once reset, if you continue to drive aggressively, the car will stay responsive. However, if you start to drive more casually, ie. stop and go traffic, light driving around town, it will start to pick up on the type of driving you do more often. It is okay to do this reset regularly, you don't run the risk of doing anything harmful but its annoying to do all the time so I do it maybe once every other month on my CL. Obviously, slower cars will not react as much as V8Komp engine but they work across the board. I even saw improved response in my girlfriends old C240 and that thing was a slug!
Member
Joined: Oct 2007
Posts: 212
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From: Reality
2021 E450 4matic
I've had the same problem since I got my car (08 E350). I tried C and S and saw little difference, you slow down for a yield sign or in a turn and when you hit the gas there's a lag. Not so much off the line, but definately when you slow down.
I guess I'll try the reset and see if it works, but that's been my single biggest complaint about this car since I got it, it's hesitation.
I guess I'll try the reset and see if it works, but that's been my single biggest complaint about this car since I got it, it's hesitation.
Out Of Control!!
Joined: Jun 2008
Posts: 10,557
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From: Earth
Porsche Macan S SportDesign / Ex M-B's: 11 & 10 & 06 E350's, 02 S500
I don't know if mine has upcoming Tranny problem symptoms or not (just got the Car, CPO'd & 31K Miles). It seems sometimes the Tranny "clunks", I would say it feels like a Tranny slip but I'm pretty sure it's not. I was thinking it was the 7-Speed being slight erratic? I know my S never did this. Sometimes it just kind of feels like it drops out then catches and makes a little clunk, or delay. Again I know these describe Tranny slipage, but is this normal? Thanks.
Out Of Control!!
Joined: Jul 2003
Posts: 15,901
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From: North Scottsdale, AZ
'71 Pinto
I don't know if mine has upcoming Tranny problem symptoms or not (just got the Car, CPO'd & 31K Miles). It seems sometimes the Tranny "clunks", I would say it feels like a Tranny slip but I'm pretty sure it's not. I was thinking it was the 7-Speed being slight erratic? I know my S never did this. Sometimes it just kind of feels like it drops out then catches and makes a little clunk, or delay. Again I know these describe Tranny slipage, but is this normal? Thanks.
Out Of Control!!
Joined: Jul 2003
Posts: 15,901
Likes: 4,633
From: North Scottsdale, AZ
'71 Pinto
MBWorld Fanatic!
Joined: Nov 2004
Posts: 1,691
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W221 S600, W220 S55 AMG Kompressor, W124 300E, W140 S320, W210 E3204M W164 ML320 Bluetec
I don't know if mine has upcoming Tranny problem symptoms or not (just got the Car, CPO'd & 31K Miles). It seems sometimes the Tranny "clunks", I would say it feels like a Tranny slip but I'm pretty sure it's not. I was thinking it was the 7-Speed being slight erratic? I know my S never did this. Sometimes it just kind of feels like it drops out then catches and makes a little clunk, or delay. Again I know these describe Tranny slipage, but is this normal? Thanks.
The dealer went into the transmission and replaced some parts. The last time I rode in the car was at about 30k miles and it was up on lease, and it has started doing the same thing again.
Same 7 speed transmission.
Out Of Control!!
Joined: Jul 2003
Posts: 15,901
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From: North Scottsdale, AZ
'71 Pinto
If the dealer replaces transmission parts (i.e.: valve body), and you experience problems again the dealer can and should replace the transmission under factory warranty, CPO, and extended warranty. All it takes is a call to Warranty Service.
Newbie
Joined: Jul 2008
Posts: 2
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2003 E320 Sport
I got 72k miles on my car and I'm getting that same lag effect when braking. This usually happens around less than 10 mph with my foot on the brake, or lightly on the brake, and when I just let it coast. It does it two to three times. Odd thing...is this common to MB's or is it a tranny gettin' ready to fail?
MBWorld Fanatic!
Joined: Nov 2004
Posts: 1,691
Likes: 143
W221 S600, W220 S55 AMG Kompressor, W124 300E, W140 S320, W210 E3204M W164 ML320 Bluetec
I got 72k miles on my car and I'm getting that same lag effect when braking. This usually happens around less than 10 mph with my foot on the brake, or lightly on the brake, and when I just let it coast. It does it two to three times. Odd thing...is this common to MB's or is it a tranny gettin' ready to fail?
Definitely will not hurt anything.
